In a large bowl, stir together yeast and water and let sit for 10-15 minutes.
Add olive oil, flour, rosemary and salt and mix until the flour is fully hydrated and no dry flour bits remain.
Turn dough into a well-oiled 9x13-inch rectangular baking pan. With oiled hands, stretch the dough across the surface of the pan so that it is evenly distributed and about an inch thick. Cover and let rest somewhere warm for at least 1 hour (or as long as a full day) until it’s doubled in size.
Once ready to bake, wet your hands and dimple the dough with your fingers pressing down to the bottom of the pan. Drizzle remaining tablespoon of olive oil across the top and add your toppings, gently pressing them into the dough.
Bake at 450°F (230ºC) for 25-30 minutes until golden. Let cool for a few minutes, then loosen from the pan and transfer to a wire cooling rack for an additional 10-15 minutes. Slice and serve warm.